STL/stl/inc/hash_map

// hash_map extension header

// Copyright (c) Microsoft Corporation.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception

#ifndef _HASH_MAP_
#define _HASH_MAP_
#include <yvals_core.h>
#if _STL_COMPILER_PREPROCESSOR
#include <xhash>

#pragma pack(push, _CRT_PACKING)
#pragma warning(push, _STL_WARNING_LEVEL)
#pragma warning(disable : _STL_DISABLED_WARNINGS)
_STL_DISABLE_CLANG_WARNINGS
#pragma push_macro("new")
#undef new

#ifndef _SILENCE_STDEXT_HASH_DEPRECATION_WARNINGS
#error <hash_map> is deprecated and will be REMOVED. Please use <unordered_map>. You can define \
_SILENCE_STDEXT_HASH_DEPRECATION_WARNINGS to suppress this error.
#endif // _SILENCE_STDEXT_HASH_DEPRECATION_WARNINGS

namespace stdext {
    using _STD allocator;
    using _STD enable_if_t;
    using _STD is_constructible_v;
    using _STD pair;
    using _STD swap;
    using _STD _Hash;
    using _STD _Is_nothrow_swappable;
    using _STD _Xout_of_range;

    template <class _Kty, // key type
        class _Ty, // mapped type
        class _Tr, // comparator predicate type
        class _Alloc, // actual allocator type (should be value allocator)
        bool _Mfl> // true if multiple equivalent keys are permitted
    class _Hmap_traits : public _Tr { // traits required to make _Hash behave like a map
    public:
        using key_type            = _Kty;
        using value_type          = pair<const _Kty, _Ty>;
        using _Mutable_value_type = pair<_Kty, _Ty>;
        using key_compare         = _Tr;
        using allocator_type      = _Alloc;
#if _HAS_CXX17
        using node_type =
            _STD _Node_handle<_STD _List_node<value_type, typename _STD allocator_traits<_Alloc>::void_pointer>, _Alloc,
                _STD _Node_handle_map_base, _Kty, _Ty>;
#endif // _HAS_CXX17

        static constexpr bool _Multi    = _Mfl;
        static constexpr bool _Standard = false;

        template <class... _Args>
        using _In_place_key_extractor = _STD _In_place_key_extract_map<_Kty, _Args...>;
        template <class>
        using _Deduce_key = const _Kty&;
        using key_equal   = _Tr;

        _Hmap_traits() = default;

        _Hmap_traits(const _Tr& _Traits) noexcept(_STD is_nothrow_copy_constructible_v<_Tr>) : _Tr(_Traits) {}

        class value_compare {
        public:
            using first_argument_type  = value_type;
            using second_argument_type = value_type;
            using result_type          = bool;

            _NODISCARD bool operator()(const value_type& _Left, const value_type& _Right) const
                noexcept(noexcept(_Keycompobj(_Left.first, _Right.first))) {
                // test if _Left precedes _Right by comparing just keys
                return _Keycompobj(_Left.first, _Right.first);
            }

            value_compare(const key_compare& _Keycomparg) noexcept(_STD is_nothrow_copy_constructible_v<key_compare>)
                : _Keycompobj(_Keycomparg) {}

            key_compare _Keycompobj;
        };

        template <class _Ty1, class _Ty2>
        _NODISCARD static const _Kty& _Kfn(const pair<_Ty1, _Ty2>& _Val) noexcept { // extract key from element value
            return _Val.first;
        }

        _NODISCARD float& _Get_max_bucket_size() noexcept {
            return _Max_buckets;
        }

        _NODISCARD const float& _Get_max_bucket_size() const noexcept {
            return _Max_buckets;
        }

        void swap(_Hmap_traits& _Rhs) noexcept(_Is_nothrow_swappable<_Tr>::value) {
            using _STD swap;
            swap(static_cast<_Tr&>(*this), static_cast<_Tr&>(_Rhs)); // intentional ADL
            _STD swap(_Max_buckets, _Rhs._Max_buckets);
        }

        float _Max_buckets = 0.0F; // current maximum bucket size
    };

    template <class _Kty, class _Ty, class _Tr = hash_compare<_Kty, _STD less<_Kty>>,
        class _Alloc = allocator<pair<const _Kty, _Ty>>>
    class hash_map : public _Hash<_Hmap_traits<_Kty, _Ty, _Tr, _Alloc, false>> {
        // hash table of {key, mapped} values, unique keys
    public:
        using _Mybase         = _Hash<_Hmap_traits<_Kty, _Ty, _Tr, _Alloc, false>>;
        using key_type        = _Kty;
        using mapped_type     = _Ty;
        using referent_type   = _Ty;
        using key_compare     = _Tr;
        using value_compare   = typename _Mybase::_Value_compare;
        using value_type      = pair<const _Kty, _Ty>;
        using allocator_type  = typename _Mybase::allocator_type;
        using size_type       = typename _Mybase::size_type;
        using difference_type = typename _Mybase::difference_type;
        using pointer         = typename _Mybase::pointer;
        using const_pointer   = typename _Mybase::const_pointer;
        using reference       = value_type&;
        using const_reference = const value_type&;
        using iterator        = typename _Mybase::iterator;
        using const_iterator  = typename _Mybase::const_iterator;
        using _Alnode         = typename _Mybase::_Alnode;
        using _Alnode_traits  = typename _Mybase::_Alnode_traits;
#if _HAS_CXX17
        using insert_return_type = _STD _Insert_return_type<iterator, typename _Mybase::node_type>;
#endif // _HAS_CXX17

        hash_map() : _Mybase(key_compare(), allocator_type()) {}

        explicit hash_map(const allocator_type& _Al) : _Mybase(key_compare(), _Al) {}

        hash_map(const hash_map& _Right)
            : _Mybase(_Right, _Alnode_traits::select_on_container_copy_construction(_Right._Getal())) {}

        hash_map(const hash_map& _Right, const allocator_type& _Al) : _Mybase(_Right, _Al) {}

        explicit hash_map(const key_compare& _Traits) : _Mybase(_Traits, allocator_type()) {}

        hash_map(const key_compare& _Traits, const allocator_type& _Al) : _Mybase(_Traits, _Al) {}

        template <class _Iter>
        hash_map(_Iter _First, _Iter _Last) : _Mybase(key_compare(), allocator_type()) {
            insert(_First, _Last);
        }

        template <class _Iter>
        hash_map(_Iter _First, _Iter _Last, const key_compare& _Traits) : _Mybase(_Traits, allocator_type()) {
            insert(_First, _Last);
        }

        template <class _Iter>
        hash_map(_Iter _First, _Iter _Last, const key_compare& _Traits, const allocator_type& _Al)
            : _Mybase(_Traits, _Al) {
            insert(_First, _Last);
        }

        hash_map& operator=(const hash_map& _Right) {
            _Mybase::operator=(_Right);
            return *this;
        }

        hash_map(hash_map&& _Right) : _Mybase(_STD move(_Right)) {}

        hash_map(hash_map&& _Right, const allocator_type& _Al) : _Mybase(_STD move(_Right), _Al) {}

        hash_map& operator=(hash_map&& _Right) noexcept(noexcept(_Mybase::operator=(_STD move(_Right)))) {
            _Mybase::operator=(_STD move(_Right));
            return *this;
        }

        mapped_type& operator[](key_type&& _Keyval) {
            return this->_Try_emplace(_STD move(_Keyval)).first->_Myval.second;
        }

        void swap(hash_map& _Right) noexcept(noexcept(_Mybase::swap(_Right))) {
            _Mybase::swap(_Right);
        }

        using _Mybase::insert;

        template <class _Valty, enable_if_t<is_constructible_v<value_type, _Valty>, int> = 0>
        pair<iterator, bool> insert(_Valty&& _Val) {
            return this->emplace(_STD forward<_Valty>(_Val));
        }

        template <class _Valty, enable_if_t<is_constructible_v<value_type, _Valty>, int> = 0>
        iterator insert(const_iterator _Where, _Valty&& _Val) {
            return this->emplace_hint(_Where, _STD forward<_Valty>(_Val));
        }

        hash_map(_STD initializer_list<value_type> _Ilist) : _Mybase(key_compare(), allocator_type()) {
            insert(_Ilist);
        }

        hash_map(_STD initializer_list<value_type> _Ilist, const key_compare& _Pred)
            : _Mybase(_Pred, allocator_type()) {
            insert(_Ilist);
        }

        hash_map(_STD initializer_list<value_type> _Ilist, const key_compare& _Pred, const allocator_type& _Al)
            : _Mybase(_Pred, _Al) {
            insert(_Ilist);
        }

        hash_map& operator=(_STD initializer_list<value_type> _Ilist) {
            this->clear();
            insert(_Ilist);
            return *this;
        }

        mapped_type& operator[](const key_type& _Keyval) {
            return this->_Try_emplace(_Keyval).first->_Myval.second;
        }

        _NODISCARD mapped_type& at(const key_type& _Keyval) {
            const auto _Target = this->_Find_last(_Keyval, this->_Traitsobj(_Keyval));
            if (_Target._Duplicate) {
                return _Target._Duplicate->_Myval.second;
            }

            _Xout_of_range("invalid hash_map<K, T> key");
        }

        _NODISCARD const mapped_type& at(const key_type& _Keyval) const {
            const auto _Target = this->_Find_last(_Keyval, this->_Traitsobj(_Keyval));
            if (_Target._Duplicate) {
                return _Target._Duplicate->_Myval.second;
            }

            _Xout_of_range("invalid hash_map<K, T> key");
        }

        using reverse_iterator       = _STD reverse_iterator<iterator>;
        using const_reverse_iterator = _STD reverse_iterator<const_iterator>;

        _NODISCARD reverse_iterator rbegin() noexcept {
            return reverse_iterator(this->end());
        }

        _NODISCARD const_reverse_iterator rbegin() const noexcept {
            return const_reverse_iterator(this->end());
        }

        _NODISCARD reverse_iterator rend() noexcept {
            return reverse_iterator(this->begin());
        }

        _NODISCARD const_reverse_iterator rend() const noexcept {
            return const_reverse_iterator(this->begin());
        }

        _NODISCARD const_reverse_iterator crbegin() const noexcept {
            return rbegin();
        }

        _NODISCARD const_reverse_iterator crend() const noexcept {
            return rend();
        }

        _NODISCARD key_compare key_comp() const {
            return this->_Traitsobj;
        }

        _NODISCARD value_compare value_comp() const {
            return value_compare(key_comp());
        }

        using _Mybase::_Unchecked_begin;
        using _Mybase::_Unchecked_end;
    };

    template <class _Kty, class _Ty, class _Tr, class _Alloc>
    void swap(hash_map<_Kty, _Ty, _Tr, _Alloc>& _Left, hash_map<_Kty, _Ty, _Tr, _Alloc>& _Right) noexcept(
        noexcept(_Left.swap(_Right))) {
        _Left.swap(_Right);
    }

    template <class _Kty, class _Ty, class _Tr, class _Alloc>
    _NODISCARD bool operator==(
        const hash_map<_Kty, _Ty, _Tr, _Alloc>& _Left, const hash_map<_Kty, _Ty, _Tr, _Alloc>& _Right) {
        return _STD _Hash_equal(_Left, _Right);
    }

    template <class _Kty, class _Ty, class _Tr, class _Alloc>
    _NODISCARD bool operator!=(
        const hash_map<_Kty, _Ty, _Tr, _Alloc>& _Left, const hash_map<_Kty, _Ty, _Tr, _Alloc>& _Right) {
        return !(_Left == _Right);
    }

    template <class _Kty, class _Ty, class _Tr = hash_compare<_Kty, _STD less<_Kty>>,
        class _Alloc = allocator<pair<const _Kty, _Ty>>>
    class hash_multimap : public _Hash<_Hmap_traits<_Kty, _Ty, _Tr, _Alloc, true>> {
        // hash table of {key, mapped} values, non-unique keys
    public:
        using _Mybase         = _Hash<_Hmap_traits<_Kty, _Ty, _Tr, _Alloc, true>>;
        using key_type        = _Kty;
        using mapped_type     = _Ty;
        using referent_type   = _Ty; // old name, magically gone
        using key_compare     = _Tr;
        using value_compare   = typename _Mybase::_Value_compare;
        using value_type      = pair<const _Kty, _Ty>;
        using allocator_type  = typename _Mybase::allocator_type;
        using size_type       = typename _Mybase::size_type;
        using difference_type = typename _Mybase::difference_type;
        using pointer         = typename _Mybase::pointer;
        using const_pointer   = typename _Mybase::const_pointer;
        using reference       = value_type&;
        using const_reference = const value_type&;
        using iterator        = typename _Mybase::iterator;
        using const_iterator  = typename _Mybase::const_iterator;
        using _Alnode         = typename _Mybase::_Alnode;
        using _Alnode_traits  = typename _Mybase::_Alnode_traits;

        hash_multimap() : _Mybase(key_compare(), allocator_type()) {}

        explicit hash_multimap(const allocator_type& _Al) : _Mybase(key_compare(), _Al) {}

        hash_multimap(const hash_multimap& _Right)
            : _Mybase(_Right, _Alnode_traits::select_on_container_copy_construction(_Right._Getal())) {}

        hash_multimap(const hash_multimap& _Right, const allocator_type& _Al) : _Mybase(_Right, _Al) {}

        explicit hash_multimap(const key_compare& _Traits) : _Mybase(_Traits, allocator_type()) {}

        hash_multimap(const key_compare& _Traits, const allocator_type& _Al) : _Mybase(_Traits, _Al) {}

        template <class _Iter>
        hash_multimap(_Iter _First, _Iter _Last) : _Mybase(key_compare(), allocator_type()) {
            insert(_First, _Last);
        }

        template <class _Iter>
        hash_multimap(_Iter _First, _Iter _Last, const key_compare& _Traits) : _Mybase(_Traits, allocator_type()) {
            insert(_First, _Last);
        }

        template <class _Iter>
        hash_multimap(_Iter _First, _Iter _Last, const key_compare& _Traits, const allocator_type& _Al)
            : _Mybase(_Traits, _Al) {
            insert(_First, _Last);
        }

        hash_multimap& operator=(const hash_multimap& _Right) {
            _Mybase::operator=(_Right);
            return *this;
        }

        hash_multimap(hash_multimap&& _Right) : _Mybase(_STD move(_Right)) {}

        hash_multimap(hash_multimap&& _Right, const allocator_type& _Al) : _Mybase(_STD move(_Right), _Al) {}

        hash_multimap& operator=(hash_multimap&& _Right) noexcept(noexcept(_Mybase::operator=(_STD move(_Right)))) {
            _Mybase::operator=(_STD move(_Right));
            return *this;
        }

        void swap(hash_multimap& _Right) noexcept(noexcept(_Mybase::swap(_Right))) {
            _Mybase::swap(_Right);
        }

        using _Mybase::insert;

        template <class _Valty, enable_if_t<is_constructible_v<value_type, _Valty>, int> = 0>
        iterator insert(_Valty&& _Val) {
            return this->emplace(_STD forward<_Valty>(_Val));
        }

        template <class _Valty, enable_if_t<is_constructible_v<value_type, _Valty>, int> = 0>
        iterator insert(const_iterator _Where, _Valty&& _Val) {
            return this->emplace_hint(_Where, _STD forward<_Valty>(_Val));
        }

        hash_multimap(_STD initializer_list<value_type> _Ilist) : _Mybase(key_compare(), allocator_type()) {
            insert(_Ilist);
        }

        hash_multimap(_STD initializer_list<value_type> _Ilist, const key_compare& _Pred)
            : _Mybase(_Pred, allocator_type()) {
            insert(_Ilist);
        }

        hash_multimap(_STD initializer_list<value_type> _Ilist, const key_compare& _Pred, const allocator_type& _Al)
            : _Mybase(_Pred, _Al) {
            insert(_Ilist);
        }

        hash_multimap& operator=(_STD initializer_list<value_type> _Ilist) {
            this->clear();
            insert(_Ilist);
            return *this;
        }

        using reverse_iterator       = _STD reverse_iterator<iterator>;
        using const_reverse_iterator = _STD reverse_iterator<const_iterator>;

        _NODISCARD reverse_iterator rbegin() noexcept {
            return reverse_iterator(this->end());
        }

        _NODISCARD const_reverse_iterator rbegin() const noexcept {
            return const_reverse_iterator(this->end());
        }

        _NODISCARD reverse_iterator rend() noexcept {
            return reverse_iterator(this->begin());
        }

        _NODISCARD const_reverse_iterator rend() const noexcept {
            return const_reverse_iterator(this->begin());
        }

        _NODISCARD const_reverse_iterator crbegin() const noexcept {
            return rbegin();
        }

        _NODISCARD const_reverse_iterator crend() const noexcept {
            return rend();
        }

        _NODISCARD key_compare key_comp() const {
            return this->_Traitsobj;
        }

        _NODISCARD value_compare value_comp() const {
            return value_compare(key_comp());
        }

        using _Mybase::_Unchecked_begin;
        using _Mybase::_Unchecked_end;
    };

    template <class _Kty, class _Ty, class _Tr, class _Alloc>
    void swap(hash_multimap<_Kty, _Ty, _Tr, _Alloc>& _Left, hash_multimap<_Kty, _Ty, _Tr, _Alloc>& _Right) noexcept(
        noexcept(_Left.swap(_Right))) {
        _Left.swap(_Right);
    }

    template <class _Kty, class _Ty, class _Tr, class _Alloc>
    _NODISCARD bool operator==(
        const hash_multimap<_Kty, _Ty, _Tr, _Alloc>& _Left, const hash_multimap<_Kty, _Ty, _Tr, _Alloc>& _Right) {
        return _STD _Hash_equal(_Left, _Right);
    }

    template <class _Kty, class _Ty, class _Tr, class _Alloc>
    _NODISCARD bool operator!=(
        const hash_multimap<_Kty, _Ty, _Tr, _Alloc>& _Left, const hash_multimap<_Kty, _Ty, _Tr, _Alloc>& _Right) {
        return !(_Left == _Right);
    }
} // namespace stdext
_STD_BEGIN
using _STDEXT hash_map;
using _STDEXT hash_multimap;
_STD_END

#pragma pop_macro("new")
_STL_RESTORE_CLANG_WARNINGS
#pragma warning(pop)
#pragma pack(pop)
#endif // _STL_COMPILER_PREPROCESSOR
#endif // _HASH_MAP_